People can bring guns most places in Arizona, but the state's Board of Regents has long banned all weapons from public college campuses. Now some lawmakers are trying to change that. State Senator Karen S. Johnson, a Republican, proposed a bill in January that would trump the regents' ban, allowing anyone with a concealed-weapons permit to carry a gun at a public college. Higher-education officials in Arizona are lobbying vigorously against the bill. More guns, they say, would make colleges more dangerous. Debate over guns on campuses has rumbled on for a decade, but it erupted around the country after the mass shooting at Virginia Tech. More than a dozen state legislatures reacted to the tragedy with bills to allow students and faculty members to carry concealed weapons. Higher-education officials panicked. But now the bills are dying. Over the past several weeks, they have failed in Alabama, Indiana, Oklahoma, South Dakota, and other states known for strong gun rights. Seven more states, including Georgia, Louisiana, and South Carolina, are still weighing the prospect of armed campuses, but the bills there are languishing.